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n'NTTnn sTATEs PATENT oFFIcE.

WILLIAM s. GALE, or New YORK, N. Y.

PISTON-VALVE FOR STEAM-BOILER REGULATORS.

Specicaton of Letters Patent No. 14,605, dated April 8, 1856,

To all whom t may concern Be it known that I, l/VILLIAM S. GALE, of thecity, county, and State of New York, have invented certain new anduseful improvements in regulators for controlling the combustion of thefuel used for steamboilers by the pressure of steam in the boiler; and Ido hereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawing, forming part of this specification, in which,-

Figure l, is a section of a regulator constructed according to myinvention. Fig. 2, is an inverted plan of the top plate of the pistonand the packing spring.

Similar letters of reference indicate corresponding parts in bothfigures.

My invention consists in a certain method of clamping the packing of thepiston of the regulator whereby it is caused to adapt itself to atapered steam cylinder.

A, in the drawing represents the cylinder,

f which is secured to a base E, and receives steam at a, through a.suitable pipe.

B, is the piston, C, the weighted lever connected with the damper and Dthe adjustable weight.

The piston is made slightly tapering to conform to the cylinder, butsomewhat smaller, is packed with a packer b, of cotton, or othersuitable substance, so applied as to be capable of expansion. Thepacking is forced out against the sides of the cylinder partly by t-headmission of steam into the piston through openings o, c, at the bottom,to act on its back side, and

partly by a spring or elastic steel ring When the damper is open thepiston is on its lowest position, where, the cylinder being larger, itfits as easily as is possible, without allowing the steam to pass it,the spring d, having at that time very little force, but as the pressureof steam overcomes the effect of the weight I), on the piston, and thepiston rises, the packing is forced inward,`and the contraction of thespring d, increases its force, and increases the friction of the piston,thus producing a gradual closing of the damper. 1When the pressure ofsteam diminishes the piston descends, first slowly, and graduallyquicker. The piston opens and closes the damper with a comparativelyshort movement.

In order to prevent the steam that is admitted to the interior of thepiston to force out the packing from passing through the packing at itsjunction with the upper part of the piston, I make the top plate F, ofthe piston with a small overhanging lip e, between which and the springd, a portion of the packing is firmly and closely confined by theelasticity of the spring.

What I claim as my invention, and desire to secure by Letters Patent,is,

The lip, c, of the piston cap, F, and the spring, d, arranged inrelation to each other and to the piston body for lthe purpose ofclamping the packing, b, as herein set forth.

WM. S. GALE.

Witnesses:

JAMES F. BUCKLEY, WM. TUsoHE.

